ANSWER: You should tell him or send him a video or text from an authentic scholar stating that masturbation is haram and he cannot pray without doing ghusl. His prayer is invalid! Kindly refer to the following link(s): https://youtu.be/HY7t91VCAfQ https://islamqa.info/en/89935

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ANSWER: This is not true. This is human nature but a true Muslim must get over it quickly and not allow it to continue. 

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ANSWER: You can intend voluntary fast any time providing you didn’t consume anything after Fajr. 

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